Safety lock for doors

ABSTRACT

A SUPPLEMENTAL LOCKING DEVICE IS PROVIDED FOR A DOOR HAVING A DOOR KNOB CONSISTING OF A PAIR OF FRAMES WHICH ARE HINGED TOGETHER AND ATTACHABLE TO A DOOR OVER THE DOOR KNOB. LOCK MEANS ARE PROVIDED TO SECURE THE PAIR OF FRAMES TOGETHER AND WHEN SO SECURED THE DOOR KNOB IS INACCESSIBLE. THE SUPPLENENTAL LOCKING DEVICE ALSO INCLUDES A SLIDE BOLT CARRIED BY THE DOOR ATTACHED FRAME WHICH SLIDE BOLT IS SIMILARLY INACCESSIBLE WHEN THE PAIR OF FRAMES ARE LOCKED TOGETHER.

A. FERRER 3,563,069

SAFETY LOCK FOR DOORS Feb. 16, 1971 I Filed July '7, 1969 [INVENTORARMANDO F ERRER ATTORNEYS United States Patent ()fice 3,563,069 PatentedFeb. 16, 1971 3,563,069 SAFETY LOCK FOR DOORS Armando Ferrel, 59 NW.28th St., Miami, Fla. 33127 Filed July 7, 1969, Ser. No. 839,438 Int.Cl. Eb 59/00, 13/00; E05c 13/02 U.S. C]. 70-129 5 Claims ABSTRACT OF THEDISCLOSURE A supplemental locking device is provided for a door having adoor knob consisting of a pair of frames which are hinged together andattachable to a door over the door knob. Lock means are provided tosecure the pair of frames together and when so secured the door knob isinaccessible. The supplemental locking device also includes a slide boltcarried by the door attached frame which slide bolt is similarlyinaccessible when the pair of frames are locked together.

BACKGROUND OF THE INVENTION Supplemental locking devices for home,office and the like doors are known which are adapted to enclosed inwhole or in part door knobs and conventional locks for the doors. Theprior art devices have drawbacks in that access to the door knob may bereadily had by for example breaking a pane of glass in the door or in aframe adjacent to the door.

The present invention is directed to an improved supplemental safetylocking device for a door which includes a pair of hingeablequadrangular frame mechanisms which enclose the door knob and when thepair of frames are locked together it is no longer possible to haveaccess to the door knob notwithstanding that panels of glass or the likeare removed from the door or from a panel adjacent to the door. Theinvention also includes a slide bolt arrangement which is primarilyhoused within the pair of hingeable frames and which also becomesinaccessible when the pair of frames are locked together.

It is an advantage of the present invention to provide such a devicewherein the slide bolt may be moved in either direction so that thesupplemental locking device may be employed on either left or right handdoors.

It is another advantage of the present invention to provide such asupplemental locking device which may be employed on either inwardly oroutwardly opening doors by merely modifying the form of the slide boltkeeper which keeper may be of conventional design.

It is a further object of the present invention to provide such asupplemental locking device which when employed with certain forms ofconventional door-locking mechanisms may be used when the occupants areoutside or inside the locked structure.

These and other objects and advantages are provided in a safety lock fora door comprising a first quadrangular frame, internal plate means forthe frame adapted to receive fasteners for attaching the frame to thedoor over the door knob, a second quadrangular frame having a closedface, hinge means connecting the first and second frames such that whenthe pair of frames are in abutting alignment the door knob is enclosedtherein, lock means separateably connecting the frames at a positionremote from the hige means, and a slide bolt carried by the first frameand adapted to be received in keeper means carried by the door frame.

The invention will be more particularly described in reference to theaccompanied drawing wherein;

FIG. 1 is a fragmentary perspective view of a door and door frame havingthe improved supplemental lock means attached thereto;

FIG. 2 is a view like that illustrated in FIG. 1 with the supplementallock means in the unlocked position;

FIG. 3 is a front elevational view of the structure as shown in FIG. 2;and

FIG. 4 is a section on line 4-4 of FIG. 3.

Referring to the drawing 10 generally designates a door hinged to swingin the direction of the directional arrow A and when in the closedposition as indicated in the drawing to cooperate with the door framegenerally designated 12 having butt plate 14 and trim strip 16. The dooris equipped with a conventional lock type door knob and opener generallydesignated 18. The lock type door opener includes the inside knob 20having a locking button 22 which may be of the rotatable or push-buttontype whereby when the button is pushed or turned to the locked positionentry through the door may be had from the outside via a key but anoccupant within the house may open the door by merely rotating the doorknob. Further, once the locking mechanism 22 is placed in the lockedposition a person within the building structure may leave and pull thedoor closed without disturbing the locked position thereof.

The supplemental locking mechanism of the present invention is generallydesignated 24 and includes a first quadrangular frame 26 having inturnedflanges 28 and 30 along the inner top and bottom edges thereof. Theseflanges are bored to receive one or more attaching devices such as theillustrated wood screws 32. By having the flanges internal of the frameaccess to the screws may only be had when the supplemental lockingdevices in an unlocked position as will be more fully evidenthereinafter. While internal flanges are only illustrated at the upperand lower marginal edges of the inner quadrangular frame 26 it will beappreciated that the flanges may also be provided on the vertical edgesof the frame or only on the vertical edges of the frame.

The assembly also includes a Second quadrangular frame 36 having aclosed face 38. The frame 36 is hinged to the first frame 26 by forexample piano type hinge 40 attached along the lower manginal edges ofthe pair of frames. Secured to the upper edge 44 of the first frame 26is a latch half generally designated 46. The latch half in theillustrated form of the invention is welded to its cooperating surfaceof the edge 44. A cooperating latch half 48 is similarily secured toWall 50 of the second quadrangular frame 36 such that when the secondframe is closed against the first frame a conventional padlock,generally designated 52, may be passed through aligned openings 54 inthe cooperating pair of latch-half members 46 and 48 as illustrated inFIG. 1 of the drawing.

With the padlock 52 in the locked position, as illustrated in FIG. 1,access to the inside of the supplemental lock is barred and the knob 20of the conventional door locking mechanism is inaccessible therebypreventing access to the building structure by merely breaking a windowin for example the door 10 or in a panel adjacent to the door frame 12and turning the door knob.

As a further safety mechanism, the first or innermost frame 26 hassecured thereto a generally tubular housing 60 which slideably receivesa slide bolt 6-2. The slide bolt is provided with an actuator 64 whichis received in a bore 66 in the bolt 62. The actuator 64 is of the typewhich may be moved a limited space generally designated B in FIG. 4 ofthe drawing relative to the slide bolt 62 and when the actuator 64 ismoved in the direction of the directional arrow C the extended end 68 ofthe member frees itself from one of three bores 70, 72, or 74 in thehousing 60 permitting the operator to slide the bolt from an inoperativeposition with the end of 68 projecting through opening 72 to a lockedposition with the end 68 projecting through opening 74.

The opening 70 shown in FIG. 3 of the drawing is employed when thestructures are mounted on a door having the lock mechanism mounted alongthe left-hand vertical edge and the hinge line at the right-handvertical edge. The upper portion of the straight leg of the actuator 64rides in a slot 80 in the generally tubular track way 60 as more clearlyshown in FIGS. 3 and 4 of the drawings.

When the supplemental lock device of the invention is mounted on a dooradapted to swing in the direction of directional arrow A the extendedend of the bolt assembly 82 is received in a keeper 84 attached to thetrim strip 16 of the door. Preferrably, the keeper 84 is attached to thetrim strip with blind screw type fasteners 86 to prevent removal of thescrews once the device has been attached to the door.

It will be recognized by those skilled in the art that where the door tothe structure opens outwardly, the keeper 84 would be of another formsuch as a bore in the door jam 14 which bore may receive a metal sleeveas is known in the art.

As herein before discussed, with a person within the building to belocked, first the door is locked in a conventional manner by the exampledepressing or turning the locking button 22; the bolt assembly is movedto the right to place the extended end 82 thereof in its keeper 84 andthe actuator 64 is moved downwardly such that its extended end 68 passesthrough the bore 74 in the tubular housing 60. Then the quadrangularframe 36 is closed and the padlock 52 is passed through the cooperatingbores 54 in the latch mechanism 4648. The door is then secure and itcannot be opened from the inside or the outside without removing thepadlock 52, opening the closed pair of frame members and withdrawing thebolt assembly.

If the door is to be secured with no occupant within the buildingstructure, the bolt assembly cannot be used; however, the pair ofcooperating frames can be padlocked as illustrated in FIG. 1 and accessto the interior of the building structure may be had by unlocking theconventional door lock 18 with a key from outside of the building.However, a person not having the door key cannot gain access to thebuilding by merely removing a window or panel structure from the door orfrom a panel adjacent to door frame 12.

From the foregoing description of a preferred embodiment of thisinvention, it will be seen that a simple, relative inexpensive andhighly effective supplemental locking means is provided for a door. Itwill also be apparent to those skilled in the art that variousmodifications may be made in the specific illustrated form of the devicewithout departing from the scope of the invention.

For example instead of employing the blind screws '86 for the keeper 84the keeper may be constructed as shown at 84' in FIG. 2 of the drawings.In this form of the invention holes 86' are provided in the barrelportion of the keeper which are aligned with smaller holes adapted toreceive conventional screws 87. It will be seen that with the bolt inthe locked position the heads of the screws 87 are covered andinaccessible.

I claim:

1. A safety lock for a door comprising a first quadrangular frame,internal plate means for such frame adapted to receive fasteners forattaching the frame to a door over the door knob, a second quadrangularframe having a closed face, hinge means connecting the first and secondframes such that when the pair of frames are in abutting alignment theyform an enclosure for the door knob, lock means separably connecting theframes at a position remote from the hinge means, supporting meanswithin the first frame, and a slide bolt carried by the supporting meansand adapted upon projection to be received in keeper means carried bythe door frame and dogging means within the enclosure cooperating withthe slide bolt to releasably secure it in the projected positionthereof.

2. The invention defined in claim 1 wherein the lock means separateablyconnecting the frames comprises a padlock received in telescopingkeepers one carried by the first frame and one carried by the secondframe.

3. The invention defined in claim 2 wherein the supporting meansincludes a tubular housing carried by the first quadrangular frame andsaid slide bolt is mounted within said tubular member.

4. The invention defined in claim 3 wherein the dogging means includespin means cooperating with the slide bolt and its housing to positivelylock the bolt in the locked and unlocked positions thereof.

5. The invention defined in claim 4 including opposed bores in thevertical walls of the first quadrangular frame to permit passage ofeither end of the slide bolt therethrough whereby the safety lock devicemay be employed on a left-hand or right-hand door.

References Cited UNITED STATES PATENTS 543,226 7/1895 Atwood 292150X1,950,503 3/1934 Mahon 70178X 2,716,882 9/1955 Gill et al. 701592,862,381 12/1958 Fresard 70-462 FOREIGN PATENTS 783,438 9/1957 GreatBritain 70-161 MARVIN A. CHAMPION, Primary Examiner A. G. CRAIG, JR.,Assistant Examiner US. Cl. X.R.

